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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Subsampling for Rare Events Data and maximum sampled conditional likelihood
罕见事件数据 子采样 最大采样 条件似然
2023/5/15
In this talk, we show that the available information about unknown parameters in rare events data is only tied to the relatively small number of cases, which justifies the usage of negative sampling. ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：逻辑动态系统研究进展
逻辑动态系统 研究进展 矩阵半张量积 代数状态空间
2023/4/25
逻辑是人类认知和交流的基本手段，因此逻辑动态系统的分析与控制是认识和改造世界的根本工具之一。此前针对逻辑系统的分析与综合缺乏合适的数学工具，本报告首先介绍基于矩阵半张量积的代数状态空间方法，并对逻辑动态系统分析与控制理论作简要回顾，进一步汇报我们在逻辑动态系统方面近期的研究进展。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：集装箱港口货运需求预测研究：以环渤海三大港口为例
集装箱港口 货运需求预测 环渤海 三大港口
2023/4/28
本文基于TEI@I理论框架，提出了适用于港口物流货运复杂系统的TEI@I的综合集成预测模型，并基于环渤海三大港口青岛港、天津港和大连港集装箱吞吐量数据,预测和分析了TEI@I的港口物流货运量的集成预测理论框架的各部分。预测结果表明，基于TEI@I集成预测模型的效果远远优于单独模型的预测结果，方向变化统计量(Dstat)的评价结果从65%-75%提高到了90%以上，对主要决策者方向性的判断更有实际意...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Prediction When Factors are Weak
因素较弱 预测 宏观经济预测
2023/5/5
In macroeconomic forecasting, principal component analysis (PCA) has been the most prevalent approach to the recovery of factors, which summarize information in a large set of macro predictors. Nevert...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Multiclass Sparse Discriminant Analysis Incorporating Graphical Structure among Predictors
预测变量 图形结构 多类稀疏 判别分析
2023/5/9
In the era of big data, many sparse linear discriminant analysis methods have been proposed for the classification and variable selection of the high-dimensional data. In order to solve the multiclass...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：粮食主产区粮食产量预测模型
粮食主产区 粮食产量 预测模型
2023/5/16
报告主要介绍东北四省区等粮食主产区的粮食产量预测的模型情况，以及模型的应用、改进空间等等。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：How to capture tourists' search behavior in tourism forecasts？A two-stage feature selection approach
旅游预测 游客 搜索行为 两阶段 特征选择方法
2023/5/16
Search engine data have been widely used and shown to be useful in tourism demand forecasting. However, considering of the vast amounts of search keywords, how to better capture the tourists' attentio...
In this paper, we describe the embedded conic solver (ECOS), an interior-point solver for second-order cone programming (SOCP) designed specifically for embedded applications. ECOS is written in low f...
Quadratic Approximate Dynamic Programming for Input-Affine Systems
approximate dynamic programming stochastic control convex optimization
2015/7/9
We consider the use of quadratic approximate value functions for stochastic control problems with input-affine dynamics and convex stage cost and constraints. Evaluating the approximate dynamic progra...
On the Validity of Long-Run Estimation Methods for Discrete-Event Systems
Validity Long-Run Estimation Methods Discrete-Event Systems
2015/7/8
On the Validity of Long-Run Estimation Methods for Discrete-Event Systems.
Rank 2 Integrable Systems of Prym Varieties.
An Excursion from Enumerative Geometry to Solving Systems of Polynomial Equations with Macaulay 2
To solve the polynomial equations mathematics geometry cross theory
2014/12/29
Solving a system of polynomial equations is a ubiquitous problem in the applications of mathematics. Until recently, it has been hopeless to find explicit solutions to such systems, and mathematics ha...
Local systems on nilpotent orbits and weighted Dynkin diagrams
Bidirectional mapping bijection clear type double algebras nilpotent orbit
2014/12/29
We study the Lusztig-Vogan bijection for the case of a local system. We compute the bijection explicitly in type A for a local system and then show that the dominant weights obtained for different loc...
Breathers on a background: periodic and quasiperiodic solutions of extended discrete nonlinear wave systems
Discrete nonlinear wave equation the discrete sine Gordon a discrete nonlinear schrodinger equation the periodic oscillation kink
2014/12/29
In this paper we investigate the emergence of time-periodic and time quasiperiodic (sometimes infinitely long-lived and sometimes very long-lived or metastable) solutions of discrete nonlinear wave eq...
Large deviations in quantum lattice systems: One-phase region
Gibbs - KMS quantum spin systems Fermi gases
2014/12/29
We give large deviation upper bounds, and discuss lower bounds, for the Gibbs-KMS state of a system of quantum spins or an interacting Fermi gas on the lattice. We cover general interactions and gener...